激发波长为514.5nm的NO_2分子激光诱导荧光光谱

Laser Induced Dispersed Fluorescence Spectra of NO_2 for Exciation at 514.5 nm

以皮秒Nd :YAG激光器的 3倍频输出 (35 5nm)泵浦光学参量产生 /放大器 (OPG /OPA) ,由其输出的 5 14 .5nm的激光作为激发源 ,在室温下 ,对NO2 分子在低气压情况下进行了激光诱导荧光研究 .获得了在 5 30～ 6 80nm范围内的振动序列 ,将其归属为由第 1电子激发态A2 B2 态向基电子态X2 A1态不同振动态的跃迁 ,由此得到对称振动模式和角振动模式的谐振频率 ,分别为ω1=130 9.17cm- 1和ω2 =74 7.0 5cm- 1.

Laser induced dispersed fluorescence spectra (LIDFS) of NO_2 molecules, excited by the output of 514.5 nm of a pulsed Nd:YAG-pumped optical parameter generator and optical parameter amplifer (OPG/OPA), was obtained and analyzed at room temperature and at low NO_2 pressure. The vibronic progressions in the range of 530～680 nm obtained at low pressure was ascribed to the transitions from the first excited electronic state A^2B_2 to the vibrational levels of the ground electronic state X^2A_1. The harmonic frequencies of symmetric stretching and bending stretching was calculated: ω_1=1 309.17 cm^(-1) and ω_2=747.05 cm^(-1), respectively.